CN104005414B - Large-size rebar cast in place concrete pile supports the constructional method of column - Google Patents

Large-size rebar cast in place concrete pile supports the constructional method of column Download PDF

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Publication number
CN104005414B
CN104005414B CN201410258350.8A CN201410258350A CN104005414B CN 104005414 B CN104005414 B CN 104005414B CN 201410258350 A CN201410258350 A CN 201410258350A CN 104005414 B CN104005414 B CN 104005414B
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column
support
pile
castinplace pile
supports
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CN104005414A (en
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彭卫平
刘志方
容穗红
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Guangzhou Urban Planning Survey and Design Institute
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Guangzhou Urban Planning Survey and Design Institute
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Abstract

Large-size rebar cast in place concrete pile supports a constructional method for column, and (1) is prefabricated: according to the stake precast reinforced cage of body distributed steel requirement; (2) construct: design pile bottom force holding layer absolute altitude at existing ground construction Cheng Kongzhi, then hang in prefabricated Steel Reinforcement Cage, castinplace pile core concrete; (3) connecting: castinplace pile and first floor concrete support and connection place, filling pile head opened by cutter, is stretched into by vertical for castinplace pile muscle and supports 30 times of bar diameters in Steel Reinforcement Cage, then pouring supports concrete, by castinplace pile together with first floor support and connection; (4) waterproof: castinplace pile column and basement bottom board intersection, protective layer opened by cutter, arranges upper and lower twice expansion water-stop bar along castinplace pile periphery, and waters in basement bottom board by whole for castinplace pile column, and basement structure abolishes top castinplace pile column after completing. The invention solves conventional steel lattice column Lack of support, cross section bending resistance anti-twisting property poor, easily damaged by mechanical collision and cause the problem of support system unstability.

Description

Large-size rebar cast in place concrete pile supports the constructional method of column
Technical field
The present invention relates to castinplace pile, especially Large-size rebar cast in place concrete pile supports the constructional method of column.
Background technology
Current known excavation of foundation pit inner support system column, it is adopt the steel lattice column formed in prefabricated Steel section member insertion Large-size rebar cast in place concrete pile (diameter 1000 or 1200mm), first castinplace pile designs absolute altitude at the bottom of stake at ground construction Cheng Kongzhi, transfer Steel Reinforcement Cage, concrete perfusion cheats end absolute altitude to base, recurrence is hung in prefabrication type Steel Latticework insertion stake core concrete and is not less than 2000mm, or together hang in stake holes after prefabricated shaped steel lattice is welded with the Steel Reinforcement Cage of castinplace pile bottom, then placing concrete is to designing absolute altitude at the bottom of basement bottom board, top backfill sand, Steel Latticework is stripped out after being convenient to excavation of foundation pit. Steel Latticework adopts 4 elongated thick 14 ~ 20mm of equal legged angle 14# ~ 20#(usually) it is welded with the batten plate of 4 pieces of 520 �� 250 �� 12mm, batten plate erects to spacing 1000mm, and steel lattice column cross section be square, the length of side 600 ~ 800mm. inner support and steel column junction, pass the vertical muscle of inner support from the space in the middle of Steel Latticework both sides or two blocks of angle steel, and the vertical muscle of inner support is then welded on angle steel by the place as passed, then placing concrete forms entirety. steel column, through the position of basement bottom board, adopts steel plate for sealing water Steel Latticework to be encased, and is cast in inside basement bottom board by Steel Latticework, and basement structure construction cuts off upper steel lattice after completing. its main drawback is that construction technology is more complicated, and steel lattice column need in producer by professional and technical personnel's processing and fabricating, and (more than 15m) when length is excessive, the control of its vertical bury pipe and transport difficulty are big, lift positioning error bigger in stake holes, two is steel lattice column cost height, and particularly to multilayer (more than 3 layers) large span support system, it is from great, shaped steel specification and grade height, and consumption is many and is difficult to reuse and causes waste,Three be erect to weight capacity and cross section resistance to bend relatively weak, when large span, Multi-layer supporting system or beam overload overweight, or support system internal cause horizontal force transmission produces bigger deformity out of plane, it is easy to cause the distortion distortion of Steel Latticework cross section, affect support system stability and safety. Steel lattice column is poor by mechanical impact ability in addition, is easily caused damage by the collision of earthmover tool in Excavation Process.
Summary of the invention
Technical problem to be solved by this invention is to provide the constructional method that a kind of Large-size rebar cast in place concrete pile supports column, to solve the construction of current steel column and use procedure Problems existing.
For solving the problems of the technologies described above, the technical scheme of the present invention is: a kind of Large-size rebar cast in place concrete pile supports the constructional method of column, comprises the following steps:
(1) prefabricated: according to the stake precast reinforced cage of body distributed steel requirement, the connection reinforcing bar burying in advance with supporting, need in advance on Steel Reinforcement Cage corresponding position colligation welding bury reinforcing bar in advance;
(2) construct: leveling place, measure after determining column stake position, design pile bottom force holding layer absolute altitude at existing ground construction Cheng Kongzhi, then hang in prefabricated Steel Reinforcement Cage, castinplace pile core concrete; Must strictly control verticality when pouring pile hole and Steel Reinforcement Cage hang in, verticality requires to be not more than 1%, and pile position deviation must not be greater than 50mm;
(3) connecting: castinplace pile and first floor concrete supported beam junction, filling pile head opened by cutter, is stretched into by vertical for castinplace pile muscle and supports 30 times of bar diameters in Steel Reinforcement Cage, then pouring supports concrete, castinplace pile and first floor supporting beam is linked together; When arranging several layers of concrete inner support beam, the reinforcing bar of some amount is buried in the place that castinplace pile and inner support beam cross in advance, model and the number needs of burying reinforcing bar in advance meet cross section shearing resistance checking computations, during construction and excavation, castinplace pile cover concrete opened by cutter, the reinforcing bar buried in advance is stretched in support Steel Reinforcement Cage and indulge muscle with support and be connected, embedded ribs enters the length supported in Steel Reinforcement Cage and is not less than 30 times of bar diameters, and by inner support beam and castinplace pile column boundary place concrete dabbing, finally water the concrete of inner support, thus inner support beam is connected with castinplace pile column;
(4) waterproof: castinplace pile column and basement bottom board intersection; protective layer opened by cutter; along castinplace pile periphery, upper and lower twice expansion water-stop bar is set; and water in basement bottom board by whole for castinplace pile column; basement structure abolishes top castinplace pile column after completing, it is ensured that the waterproof effect of basement bottom board is not influenced.
As improvement, before precast reinforced cage, column need to be laid according to inner support system, what the deadweight of inner support system, axial force of the supports and the top overload that checking computations single upright column need to be shared respectively was formed erects to pressure and horizontal component, carry out erecting according to " technical code for building pile foundation (JGJ94-2008) " again and check to horizontal bearing capacity, determining the diameter of castinplace pile and effective building-in depth, castinplace pile diameter selects 600 ~ 1000mm; Stake body moment of flexure is calculated according to the horizontal component that castinplace pile column is shared, so that it is determined that grout pile body arrangement of reinforcement.
As improvement, in step (3), burying reinforcing bar in advance is that welding or colligation are connected with the mode of connection supporting main muscle.
As improvement, in step (3), castinplace pile and inner support beam are two-way or how to cross to support, vow footpath 600 ~ 800mm Steel Concrete annulus in stake arranged outside, and to strengthen support node integral rigidity, in annulus, arrangement of reinforcement meets minimum steel ratio.
As improvement, in step (3), the mode of bar planting can be adopted to replace placing concrete at inner support beam and castinplace pile column boundary place, the model of bar planting and number needs meet cross section shearing resistance checking computations, the length that bar planting enters in castinplace pile column and support Steel Reinforcement Cage is not less than 35 times of bar diameters, to how can arrange annulus to support intersection point.
As improvement, if what inner support system adopted is that steel pipe supports, then by prefabricated steel bracket expansion bolt nail with it the grout pile, thus holds steel pipe and support.
The useful effect that the present invention compared with prior art brings is:
1, adopting Large-size rebar cast in place concrete pile to do column, Steel Reinforcement Cage makes in working-yard, and pouring pile hole, Steel Reinforcement Cage are laid with concrete spouting construction technology ripe, simple to operate, quality controllable;
2, it erects and all greatly improves to, Its ultimate bearing capacity and cross section bending resistance anti-twisting property, efficiently solves steel column because of vertical bearing capacity distortion distortion not or under stronger horizontal force action and causes the problem of support system unstability;
3, the steel lattice column that large-section in-situ concrete pile column impact resistant and anti-side are welded higher than angle steel and batten plate far away to the ability of soil pressure, solves the problem that steel column is easily caused damage in pit earthwork digging process by large-scale mechanical collision;
4, adopting large-section in-situ concrete pile to do column, globality and stability are strong, double can do vault anti-floating stake, it is achieved two use simultaneously, save construction costs;
5, large-section in-situ concrete pile is adopted to do column, stake body erects and undertakes primarily of concrete to load, stake body moment of flexure is less, the ratio of reinforcement is low, comparing steel lattice column, rolled steel dosage greatly reduces, and the cost of single upright column greatly reduces, the effect that Ji Keng reduces investment cost more deeply is more obvious, average saving construction cost about 20 ~ 50%;
6, to many to support node, arrange at castinplace pile column periphery and vow footpath 600 ~ 800mm Steel Concrete annulus, by each support node with column stake is whole water together with, effectively improve support node rigidity and stability, particularly to large span annular brace system, greatly improve the ability of support system opposing nonaffine deformation, strengthen support safety degree.
Accompanying drawing explanation
Fig. 1 is castinplace pile column stake schematic diagram.
Fig. 2 is castinplace pile column stake body arrangement of reinforcement schematic diagram.
Fig. 3 is castinplace pile column and first floor concrete supported beam connection diagram.
Fig. 4 is that castinplace pile column and concrete supported beam are in connection diagram () in stake.
Fig. 5 is that castinplace pile column and concrete supported beam are in connection diagram (two) in stake.
Fig. 6 is castinplace pile column periphery Steel Concrete annulus node schematic diagram.
Fig. 7 is that castinplace pile column and steel pipe support bracket connection diagram.
Fig. 8 is castinplace pile column and basement bottom board connection diagram.
Fig. 9 is process flow sheet of the present invention.
Embodiment
Below in conjunction with Figure of description, the invention will be further described.
Large-size rebar cast in place concrete pile supports a constructional method for column, as shown in Figure 9, comprises the following steps:
(1) Design calcu-lation: as shown in Figure 1, 2, column is laid according to inner support system, what the deadweight of inner support system, axial force of the supports and the top overload that checking computations single upright column need to be shared respectively was formed erects to pressure and horizontal component, carry out erecting according to " technical code for building pile foundation (JGJ94-2008) " again and check to horizontal bearing capacity, determining the diameter D and effective building-in depth H of castinplace pile, castinplace pile diameter D selects 600 ~ 1000mm; Stake body moment of flexure is calculated according to the horizontal component that castinplace pile column is shared, so that it is determined that grout pile body arrangement of reinforcement, as vertical in castinplace pile muscle 1, spiral bar 3 and hoop 2 of putting more energy into.
(2) prefabricated: according to the stake precast reinforced cage of body distributed steel requirement, the connection reinforcing bar burying in advance with supporting, need in advance on Steel Reinforcement Cage corresponding position colligation welding bury reinforcing bar in advance;
(3) construct: leveling place, measure after determining column stake position, design pile bottom force holding layer absolute altitude at existing ground construction Cheng Kongzhi, then hang in prefabricated Steel Reinforcement Cage 10, castinplace pile core concrete;Must strictly control verticality when pouring pile hole and Steel Reinforcement Cage 10 hang in, verticality requires to be not more than 1%, and pile position deviation must not be greater than 50mm;
(4) connect: as shown in Figure 3, castinplace pile 7 and first floor concrete supported beam 4 junction, castinplace pile 7 heads opened by cutter, and being stretched into by vertical for castinplace pile muscle 1 and supporting 30D(D in Steel Reinforcement Cage 10 is bar diameter), pouring supports concrete again, castinplace pile 7 and first floor supporting beam 4 is linked together, as shown in Figure 4, when arranging several layers of concrete inner support beam 4, the reinforcing bar of some amount is buried in the place that castinplace pile 7 and inner support beam 4 cross in advance, model and the number needs of burying reinforcing bar in advance meet cross section shearing resistance checking computations, during construction and excavation, castinplace pile protective layer 5 concrete opened by cutter, the reinforcing bar buried in advance is stretched in support Steel Reinforcement Cage 10 and indulge muscle 6 with supporting beam and be connected, the mode of connection burying reinforcing bar muscle 6 vertical with supporting beam in advance is that welding or colligation are connected, it is bar diameter that the length that embedded ribs enters in support Steel Reinforcement Cage 10 is not less than 30D(D), and be bar diameter at 35D(D) have the steel bar stress area of joint to be not more than the 50% of the total area in scope, as for two-way or how to cross to support, vowed footpath 600 ~ 800mm Steel Concrete annulus in stake arranged outside, to strengthen support node integral rigidity, in annulus, arrangement of reinforcement meets minimum steel ratio, by inner support beam 4 and castinplace pile column 71 boundary place concrete dabbing, finally water the concrete of inner support beam 4, thus inner support beam 4 is connected with castinplace pile column 71, as shown in Figure 5, also can adopt and replace placing concrete in the mode of inner support beam 4 with castinplace pile column 71 boundary place's bar planting 13, the model of bar planting 13 and number needs meet cross section shearing resistance checking computations, it is bar diameter that the length that bar planting 13 enters in castinplace pile column 71 and support Steel Reinforcement Cage 10 is not less than 35D(D), to how can arrange annulus to support intersection point, as shown in Figure 6, as many to support, Steel Concrete hoop 9 can be added,
As shown in Figure 7, if what inner support system adopted is that steel pipe supports 11, then prefabricated steel bracket expansion bolt 12 is followed closely with it the grout pile 71, thus hold steel pipe and support;
(5) waterproof: as shown in Figure 8; castinplace pile column 71 and basement bottom board 15 intersection; protective layer opened by cutter; along castinplace pile periphery, upper and lower twice expansion water-stop bar 14 is set; and water in basement bottom board 15 by whole for castinplace pile column 71; basement structure abolishes top castinplace pile column 71 after completing, it is ensured that the waterproof effect of basement bottom board 15 is not influenced.
Example
Shi Gangdong location, Fanyu development project is positioned at Shi Gang East Road, Fanyu District, Guangzhou city, divides into one��bis-layer of vault, and building �� 0.00 is equivalent to Guangzhou urban construction elevation 7.600m, and base hole girth is about 660m, the excavation of foundation pit degree of depth about 6.4��10.2m. Ji Keng dig in dark scope disclose successively banket, mud, flour sand, plastic��hard chiltern cohesive soil etc., the base end, hole, is mainly arranged in stream and moulds ~ soft shape mud (mucky soil) layer or the silty sand ground moulded, and local is positioned at the chiltern viscous soil horizon of plastic��hard plastic. Base hole periphery closes on 6 layers of residential building on municipal administration major trunk roads and pile tube basis, it is distributed with blow-off pipe, water service pipe, cable trench etc., according to the excavation of foundation pit degree of depth and Geological condition, this engineering pattern foundation pit supporting structure mainly adopts stake support support form, local adopts pile-anchor retaining, one layer of vault region adopts and supports together, and two layers of vault region adopt two roads to support, and outside adopts single mixing pile sealing.Owing to base hole end silt seam is comparatively deep, consider that steel lattice column stability is poor, for preventing support system unstability, supporting column all adopts �� 1000 Large-size rebar cast in place concrete pile as column stake, first supports and is connected whole the watering in stake top with column stake, and second supports and is connected in stake body bar planting with column stake. Column stake enter strong-weathered rock be not less than 8m or in micro-decayed rack be not less than 3m, simultaneously double do basement bottom board uplift pile. This engineering is completed at present, and column stake sedimentation is less, and largest settlement is stablized more than 5mm, excavation rear support system, and the accumulative distortion amount of Ji Keng is in design permissible value scope, have received good Social and economic benef@.

Claims (6)

1. the constructional method of a Large-size rebar cast in place concrete pile support column, it is characterised in that, comprise the following steps:
(1) prefabricated: according to the stake precast reinforced cage of body distributed steel requirement, that intends arranging the corresponding position colligation welding of support and support and connection on Steel Reinforcement Cage buries reinforcing bar in advance;
(2) construct: leveling place, measure after determining that castinplace pile supports stud, design pile bottom force holding layer absolute altitude at existing ground construction Cheng Kongzhi, then hang in prefabricated Steel Reinforcement Cage, castinplace pile core concrete; Supporting when column becomes hole and Steel Reinforcement Cage to hang at castinplace pile and must strictly control verticality, verticality requires to be not more than 1%, and pile position deviation must not be greater than 50mm;
(3) connect: castinplace pile supports column and first floor concrete supported beam junction, cutter is opened castinplace pile and is supported column stake head, castinplace pile supports the vertical muscle of column stretch into and support 30 times of bar diameters in Steel Reinforcement Cage, then pouring supports concrete, castinplace pile is supported column and first floor supporting beam links together, when arranging several layers of concrete inner support beam, the reinforcing bar of some amount is buried in the place that castinplace pile support column and inner support beam cross in advance, model and the number needs of burying reinforcing bar in advance meet cross section shearing resistance checking computations, during construction and excavation, cutter is opened castinplace pile and is supported column cover concrete, the reinforcing bar buried in advance is stretched in support Steel Reinforcement Cage and indulge muscle with support and be connected, embedded ribs enters the length supported in Steel Reinforcement Cage and is not less than 30 times of bar diameters, and inner support beam and castinplace pile are supported column boundary place concrete dabbing, finally water the concrete of inner support beam, thus inner support beam and castinplace pile are supported column and is connected,
(4) waterproof: castinplace pile supports column and basement bottom board intersection; protective layer opened by cutter; support column periphery along castinplace pile and upper and lower twice expansion water-stop bar is set; and castinplace pile is supported that column is whole to be watered in basement bottom board; basement structure is abolished top castinplace pile and is supported column after completing, it is ensured that the waterproof effect of basement bottom board is not influenced.
2. Large-size rebar cast in place concrete pile according to claim 1 supports the constructional method of column, it is characterized in that: before precast reinforced cage, column need to be laid according to inner support system, what the deadweight of inner support system, axial force of the supports and the top overload that checking computations single upright column need to be shared respectively was formed erects to pressure and horizontal component, carry out erecting according to " technical code for building pile foundation (JGJ94-2008) " again and check to horizontal bearing capacity, determining that castinplace pile supports the diameter of column and effective building-in depth, castinplace pile supports column diameter and selects 600 ~ 1000mm; Stake body moment of flexure is calculated, so that it is determined that castinplace pile supports column stake body arrangement of reinforcement according to the horizontal component that castinplace pile support column is shared.
3. Large-size rebar cast in place concrete pile according to claim 1 supports the constructional method of column, it is characterised in that: in step (3), burying reinforcing bar in advance is that welding or colligation are connected with the mode of connection supporting main muscle.
4. Large-size rebar cast in place concrete pile according to claim 1 supports the constructional method of column, it is characterized in that: in step (3), castinplace pile supports column and inner support beam is two-way or how to cross to support, footpath 600 ~ 800mm Steel Concrete annulus is vowed in stake arranged outside, to strengthen support node integral rigidity, in annulus, arrangement of reinforcement meets minimum steel ratio.
5. Large-size rebar cast in place concrete pile according to claim 1 supports the constructional method of column, it is characterized in that: in step (3), supporting column boundary place at inner support beam and castinplace pile can adopt the mode of bar planting to replace placing concrete, the model of bar planting and number needs meet cross section shearing resistance checking computations, the length that bar planting enters in castinplace pile support column and support Steel Reinforcement Cage is not less than 35 times of bar diameters, to how can arrange annulus to support intersection point.
6. Large-size rebar cast in place concrete pile according to claim 5 supports the constructional method of column, it is characterized in that: if the employing of inner support system is that steel pipe supports, then prefabricated steel bracket expansion bolt nail is supported with it column stake at castinplace pile, thus hold steel pipe and support.
CN201410258350.8A 2014-06-12 2014-06-12 Large-size rebar cast in place concrete pile supports the constructional method of column Active CN104005414B (en)

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Publication number Priority date Publication date Assignee Title
CN105178292B (en) * 2015-07-28 2017-03-08 济南轨道交通集团有限公司 A kind of composite pile structure as tunneling garage column and its construction method
CN106087991B (en) * 2016-06-17 2018-07-31 中国建筑第八工程局有限公司 Stake top absolute altitude is in natural ground dug pile construction method below
CN113186991B (en) * 2021-05-25 2022-04-12 南京长江都市建筑设计股份有限公司 Anti-floating structure and construction method thereof

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CN103046542A (en) * 2012-12-04 2013-04-17 中建三局建设工程股份有限公司 Simultaneous construction technology for deep foundation pit inner support steel tube column and cast-in-place concrete pile

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Publication number Priority date Publication date Assignee Title
JP2009114662A (en) * 2007-11-02 2009-05-28 Kajima Corp Concrete solid permanent sub-substructural column
KR20100062395A (en) * 2008-12-02 2010-06-10 이동희 Underground floor construction method using pre-concrete
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CN102733395A (en) * 2012-07-04 2012-10-17 江苏省华建建设股份有限公司 Connecting method of supporting beam at second path or under second path and vertical column pile in deep foundation pit of basement of building engineering
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